Pre-crystalline intraocular implant

ABSTRACT

A pre-crystalline intraocular implant adapted to be implanted between the front face of the crystalline lens and the iris. It comprises an optical part ( 31 ) and a haptic part. The haptic part comprises a haptic ring ( 32 ) surrounding the optical part ( 31 ), a peripheral band ( 34 ) and branches ( 33 ) linking the haptic ring ( 32 ) and the peripheral band ( 34 ). The rear face of the implant comprises a central portion with spherical surface having a first radius, a second annular spherical portion having a radius greater that the first radius and a third concentric portion with spherical surface having a radius greater than the second radius. The invention is useful for correcting ametropia of a phakic eye.

The present invention relates to a precrystalline intraocular implant.

It relates generally to posterior chamber intraocular implants for aphakic eye, in particular for correcting ametropias of a young patientwith a clear crystalline lens.

This kind of intraocular implant is implanted between the anterior faceof the crystalline lens and the iris.

The narrowness and the environment of the space between the iris and thecrystalline lens give rise to problems in the successful use of thistype of implant. Too strong a contact with the posterior face of theiris can lead to depigmentation thereof and rubbing on the crystalloidcan cause a cataract of the crystalline lens.

Similarly, this kind of implant is affected by anterior-posteriormovements of the center of the crystalline lens during accommodation fornear vision, which causes problems with stabilizing and centering thiskind of implant.

The posterior surface of the optic of precrystalline implants isspherical, and has a particular radius, typically 10.5 mm. This choiceis advantageous from the fabrication point of view, but the anteriorface of the crystalline lens when relaxed does not have a singlespherical surface, but in reality an aspherical surface, with aninfinite number of successive spherical surfaces.

Obviously an implant whose posterior spherical surface has only oneradius is not able to espouse the anterior surface of the crystallinelens.

Similarly, the position relative to the anterior surface of thecrystalline lens of precrystalline implants in which the posteriorsurface of the optic has a single radius of curvature is somewhat hitand miss. This results in some instability of the position of theimplant relative to the crystalline lens.

Furthermore, most precrystalline implants are spaced apart from theanterior face of the crystalline lens and therefore avoid any contactwith it.

WO-98/17205 describes an intraocular lens for a phakic eye adapted to beimplanted between the anterior face of the crystalline lens and theiris, comprising an optical part formed on a central body and a hapticpart, the posterior face of the lens having a central spherical firstportion having a first radius and an annular spherical second surfaceportion having a second radius greater than the first radius. The radiusof curvature of the central spherical first portion is much smaller thanthe radius of curvature of the anterior face of the crystalline lens, toreduce the probability of contact with the crystalline lens at thecenter. The diameter of the circumference of the haptic part is smallerthan the diameter of the corresponding ciliary sulcus and the contact ofthe anterior face with the iris in order for the lens to beself-centering.

To this end, the present invention provides a precrystalline intraocularimplant adapted to be implanted between the anterior face of thecrystalline lens and the iris, the implant comprising an optical partformed on a central body without impeding accommodation and a hapticpart.

According to a first aspect of the invention, the posterior face of thebody includes a central spherical surface portion having a first radius,an annular spherical second surface portion having a second radiusgreater than the first radius, and a concentric spherical third surfaceportion surrounding the second portion and having a third radius greaterthan the second radius.

In a preferred embodiment of this aspect of the invention, the outsidediameter of the peripheral ring is less than or equal to the diameter ofthe anterior face of the crystalline lens, and the peripheral ringtherefore does not bear in the sulcus. In this case, a centered andstable position is ensured by the complementary shapes of the sphericalsurfaces of the posterior face of the body and the corresponding areasof the anterior face of the crystalline lens. In this embodiment, thehaptic part of the concentric spherical third surface portion matchesthe corresponding part of the crystalline lens when relaxed. Largeapertures in the haptic part protect the metabolism of the crystallinelens.

This preferred embodiment has an important advantage at the time ofimplantation. The implant must be released into the posterior chamber infront of the crystalline lens without worrying about placing theperipheral part in the ciliary sulcus, which the surgeon cannot see.Furthermore, because of the small thickness of this kind of implant andits small diameter, which is approximately 10 mm, the implant can beinserted through a 2 mm self-healing corneal or sclerotic-cornealincision. Finally, in this embodiment, the posterior surface of theimplant espouses the interior face of the crystalline lens when relaxedin three areas with different radii, from the smallest at the center tothe largest at the periphery.

According to another aspect of the invention, the peripheral ring of thehaptic part is adapted to bear in the ciliary sulcus. The presence ofthis peripheral ring prohibits any decentering of the precrystallineintraocular implant in the posterior chamber. For this kind of implant,it is sufficient for the posterior face of the body to include aspherical central surface portion with a first radius and a sphericalannular surface portion having a second radius greater than the firstradius.

The haptic part preferably includes at least four radial arms ofconstant width and inclined toward the rear at an angle of 10°.

Thanks to the configuration of the posterior surface of the centralbody, the latter perfectly matches the convex shape of the surface ofthe anterior face of the crystalline lens, which minimizes the overallsize and at the same time increases the actual surface area of contactbetween the posterior face of the central body and the crystalline lens.

With implants in accordance with either aspect of the invention, theradius of curvature of the anterior face of the central body, or each ofthe radii of curvature thereof, is calculated as a function of theametropia to be corrected.

In one embodiment of the invention it is the whole of the body thatconstitutes the optical part, for example a monofocal optical part, andthe anterior face of the body has a spherical central surface having afirst radius and a spherical annular surface having a second radius.This kind of embodiment is particularly suitable for a convergentmeniscus optic for correcting hypermetropia.

In another embodiment, it is only the central part of the body thatdefines the optical part, the body having a nonrefractive ring aroundthis central part. With this kind of body, the anterior surface canadvantageously be spherical with a single radius of curvature in thecase of a divergent optic for correcting myopia (i.e. concave ordivergent meniscus optic).

Despite the resulting close contact between the posterior face of thecentral body of the implant and the anterior face of the crystal lenswhen relaxed, aqueous humor continues to circulate between these twosurfaces, in particular because of anterior-posterior movements of thecenter of the crystalline lens on the occasion of accommodation, whichmodifies the radius of curvature of the central zone of the anteriorface of the crystalline lens, and aqueous humor is aspirated into thespace formed in this way between the body and the crystalline lens.

To enable the implant to be inserted through a small incision, thematerial of which the implant is made is flexible and highly hydrophilicand has a high refractive index. This kind of implant can have a minimumthickness close to 30 μm at the center of the optic for negative diopterimplants for correcting myopias and 30 μm at the edge of the optic forpositive diopter implants for correcting hypermetropias. For the contactwith the iris and the crystalloid to have no physiological effect, thesurface of the implant is made as smooth as possible, for examplepolished to a finish of 2 to 3 nm.

According to a preferred feature of the invention, the haptic partincludes a peripheral ring and arms connecting the peripheral edge ofthe central body to the peripheral ring.

According to another preferred feature of the invention, the haptic partincorporates large diameter apertures delimited by a pair of arms, theedge of the body and the peripheral ring. These apertures in the hapticpart of the intraocular implant, situated at the periphery of thecrystalline lens, facilitate good contact of the aqueous humor with theanterior face of the equatorial region of the crystalline lens, despitethe presence of the precrystalline intraocular implant on the anteriorface of the crystalline lens.

This is because the metabolically active areas of the crystalline lensare on the anterior face of the crystalline lens, and more particularlyat its equator, where cellular multiplication occurs and crystallinefibers are synthesized.

Other features and advantages of the invention will become more apparentin the course of the following description.

In the accompanying drawings, which are provided by way of nonlimitingexample:

FIG. 1 is a front view of one embodiment of a precrystalline intraocularimplant according to the invention;

FIG. 2 is a view in cross section of the precrystalline intraocularimplant shown in FIG. 1;

FIG. 3 is a view in cross section of the precrystalline intraocularimplant shown in FIG. 1, when in position in the posterior chamber ofthe eye;

FIG. 4 is a front view of a preferred embodiment of a precrystallineintraocular implant according to the invention;

FIG. 5 is a view in cross section of the precrystalline intraocularimplant shown in FIG. 4;

FIG. 6 is a view in section of the precrystalline intraocular implantshown in FIG. 4, when in position in the posterior chamber of the eye;

FIG. 7 is a view in cross section of a different preferred embodiment ofthe precrystalline intraocular implant;

FIG. 8 is a view in section of the precrystalline intraocular implantshown in FIG. 7, when in position in the posterior chamber of the eye;

FIG. 9 is a view in cross section of a further preferred embodiment ofthe precrystalline intraocular implant;

FIG. 10 is a view in section of the precrystalline intraocular implantshown in FIG. 9, when in position in the posterior chamber of the eye;and

FIG. 11 is a partial view in section and to a larger scale showing theradii of curvature of three concentric spherical portions of theposterior face of the implants shown in FIGS. 5, 7 and 9.

One embodiment of a precrystalline intraocular implant according to theinvention is described first with reference to FIGS. 1 to 3.

The intraocular implant 10 is adapted to be positioned in the posteriorchamber 4 of a phakic eye 1.

To be more precise, this intraocular implant 10 is implanted between theanterior face of the crystalline lens 2 and the iris 3.

The intraocular implant 10 has an optical part 6 for correcting anametropia in an eye with a clear crystalline lens and a haptic part 7adapted to support the optical part inside the eye.

In this nonlimiting example, the optical part 6 is adapted to correctmyopia.

The intraocular implant 10 includes a central body 8 and a supportstructure 9 that globally surrounds the body.

The haptic part 7 includes a nonrefractive ring 12 on the central body 8surrounding the optical area 11 that includes the optical part 6, aperipheral ring 14, and arms connecting the nonrefractive ring 12 to theperipheral ring 14.

In this example, the haptic part 7 has four radial arms, of constantwidth, spaced at 90° in quadrature around the nonrefractive ring 12.

Apertures 15 are therefore formed between the arms 13, the nonrefractivering 12 and the peripheral ring 14.

The width of the radial arms 13 is preferably relatively small comparedto the dimensions of the apertures 15.

The apertures 15 thus extend over a total angular sector much greaterthan 180°, allowing excellent contact of the aqueous humor with theanterior face of the crystalline lens 2 to which the intraocular implant10 has just been fitted, and in particular its equatorial region.

Moreover, as can be seen better in FIG. 11, the arms 13 are connected tothe nonrefractive ring 12 by thinned portions 16 which therefore formhinges at the junction of the arms 13.

Furthermore, blind holes 17 opening onto the anterior face are providedat the junction between the radial arms 13 and the peripheral ring 14,to facilitate manipulation of the implant when in place in the posteriorchamber 4 of the eye.

As shown in FIG. 3, the intraocular implant conforming to thisembodiment of the invention is adapted to position itself spontaneouslyon the anterior face of the relaxed crystalline lens 2, thanks to thecomplementary shapes of the posterior surface of the implant and thecrystalline lens. Moreover, the peripheral ring 14 of the haptic part isadapted to bear in the ciliary sulcus 5 of the eye, which opposesdecentering of the implant all around its circumference.

The posterior face 10A of the implant 10 includes at least twoconcentric spherical surface portions whose radii of curvature aresubstantially equal to the radii of curvature of the correspondinganterior face of the relaxed crystalline lens 2. As shown here, theposterior surface 10A of the body 8 includes a central surface portion10B and an annular portion 10C and the central portion 10B has a radiusof curvature (R1) less than the radius of curvature (R2) of the firstannular portion 10C, and finally a second annular portion 10Dsurrounding the first annular portion 10C. In practice the radius of thecentral portion 10B is approximately 10.5 mm, or less, and the radius ofthe annular portion 10C is approximately 14 mm, or less.

To match the shape of the posterior chamber of the eye, the arms 13 areinclined toward the rear at an angle α substantially equal to 10° as faras the peripheral ring 14 of the haptic part of the implant 10.

The implant 10 therefore espouses as well as can be expected the shapeof the posterior chamber of the eye, without modifying it, i.e. withoutrubbing on the iris 3 at the front or pushing on the crystalline lens 2at the rear.

In practice, the optical area 11 of the body 8 of the implant can have adiameter equal to 4 mm in the case of correcting myopia. In the case ofcorrecting hypermetropia, the optical area 11 has a diameter equal tothat of the body 8 and the ring on the body is optical and not haptic.

The body 8 has a diameter substantially equal to 6 mm.

Finally, in order to bear in the ciliary sulcus, the peripheral ring 14has an overall diameter substantially equal to 12 mm.

An embodiment conforming to another aspect of the invention is describednext with reference to FIGS. 4 to 6, 7 and 8, 9 and 11. Unlike theembodiment shown in FIGS. 1 to 3, the peripheral ring 24 does not bearin the ciliary sulcus, but is held in position on the anterior face ofthe crystalline lens by the complementary shapes of the posteriorsurface of the implant and the anterior face of the crystalline lens,which it closely espouses (and possibly by contact with the posteriorsurface of the iris), in the manner of a contact lens between the corneaand the eyelid.

As shown in FIGS. 6, 8 and 10, an intraocular implant 20, 30, 40 can beimplanted between the anterior face of the crystalline lens 2 and theiris 3 in a phakic eye 1. The implant has an optical part 6′, a hapticpart 7′ and a central body 81 surrounded by a support structure 9′.

A central optical area 21 is formed on the central body 8′ and can beidentical to the central body 6 previously described, adapted to correctmyopia, as shown in FIGS. 1 to 4.

Note that, because of the geometry of its anterior surface, this opticalpart is naturally adapted to correct any other ametropia of a phakiceye, and in particular hypermetropia, as shown in FIGS. 7 and 8.

In this case, the optical part 6′ comprises a convergent meniscus lensof the kind routinely used to correct some kinds of hypermetropia.

The geometry of the anterior surface of the optical part can be adaptedto correct myopia of the phakic eye, as shown in FIG. 9. This examplecorresponds to myopias from 0 to −12 diopters. In this case, the opticalpart 6′ comprises a divergent meniscus lens. For stronger myopias (ofmore than −12 diopters in this example) the optic is biconcave, as shownin FIG. 5.

Generally speaking, the optical part of the implant can be adapted tocorrect presbyopia, in addition to the usual ametropias, by employingbifocal implant techniques, or even multifocal implant techniques, wellknown to the person skilled in the art, whilst retaining the sphericalsurface portions on the posterior face of the body.

As previously, the haptic part 7′ of this intraocular implant 20, 40includes a nonrefractive ring 22, 42 on the body 8′ surrounding theoptical area 21, a peripheral ring 24, 44, and arms 23, 43 connectingthe nonrefractive ring 22, 42 of the body to the peripheral ring 24. Onthe other hand, in the intraocular implant 30, the haptic part 7′includes a peripheral ring 34 and arms 33 connecting the body to theperipheral ring 24.

To improve the circulation of the aqueous humor, the apertures 25 in thehaptic part preferably extend over a total angular sector greater thanor equal to 180°.

In this example, the haptic part includes radial arms 23, 33, 43 in theshape of angular sectors delimiting two by two apertures 25. One radialedge of one aperture can include a notch to identify the front face ofthe implant.

Here, each radial arm 23, 33, 43 and each aperture 25 extend over equalangular sectors.

Furthermore, to improve the flexibility of the implant, the haptic partalso includes thinned portions 26, 36, 46 that form hinges at thejunction of the arms 23, 33, 43 and the nonrefractive ring 22 on thecentral body 8′.

On the other hand, in contrast to the intraocular implant 10 conformingto the first embodiment shown in FIGS. 1 to 3, the overall dimensions ofthis intraocular implant 20, 30, 40 are significantly smaller, with theresult that the peripheral ring 24 of the haptic part does not bear inthe ciliary sulcus 5 of the eye, as shown in FIGS. 6, 8 and 10, and inpractice does not extend beyond the periphery of the anterior face ofthe crystalline lens.

On the contrary, this precrystalline intraocular implant 20, 30, 40 issimply held between the anterior face of the crystalline lens and theiris, contact with which is inevitable, through a biconcave optical part(FIG. 6), or a convergent meniscus optical part (FIG. 8), or a divergentmeniscus optical part (FIG. 10).

In order to remain centered in the posterior chamber 5, theprecrystalline intraocular implant is adapted to adhere spontaneously tothe anterior face of the relaxed crystalline lens 2 by virtue of theclosely complementary shapes of the posterior surface and the anteriorface of the crystalline lens.

To this end, the posterior face 20A, 30A, 40A of the implant 20, 30, 40has three concentric surface portions 21A, 22A, 23A, 31A, 32A, 33A, 41A,42A, 43A whose radii of curvature are substantially equal to thecurvature of the corresponding anterior face of the relaxed crystallinelens 2.

As previously, the first two concentric surface portions 21A, 22A, 31A,32A, 41A and 42A correspond to the central optical area 21, 31, 41 andto the ring 22, 32, 42 of the implant 20, 30, 40.

The third concentric surface portion 23A, 33A, 43A corresponds to thearms 23, 33, 43 and to the peripheral ring 24 of the haptic part of theintraocular implant 20, 30, 40.

This triple radius of curvature of the posterior face 20A, 30A, 40A ofthe implant 20, 30, 40 enables the implant to espouse closely theanterior face of the relaxed crystalline lens 2.

The presence of this third radius of curvature (R3) on the posteriorface 20A, 30A, 40A of the implant 20, 30, 40 eliminates the need for ahaptic peripheral ring bearing in the ciliary sulcus 5.

In a practical embodiment, described here by way of nonlimiting example,the central optical area 21, 31, 41 has a diameter substantially equalto 4 mm and the radius of curvature of its posterior face in the firstportion 21A, 31A, 41A of the spherical surface is from 8 to 10.5 mm andpreferably equal to 9.5 mm.

The ring 22, 32, 42 has a diameter substantially equal to 6 mm and theradius of curvature of its posterior face is from 12 to 14 mm andpreferably substantially equal to 13 mm.

Finally, the radial arms 23, 33, 43, of which there are six in thisexample, and a peripheral ring 24 are inscribed in a circle having adiameter of at least 10 mm and preferably 11 mm. This dimension must beless than or equal to the diameter of the anterior face of thecrystalline lens. The radius of curvature of the anterior and posteriorfaces of this portion of the implant, consisting of the radial arms 23,33, 43 and the peripheral ring 24, is from 17 to 25 mm and preferablysubstantially equal to 17 mm.

As previously, note that the radii of curvature R1, R2, R3 of theposterior face of each of the implants 20, 30, 40 (FIG. 11) increasesfrom the center toward the periphery of the implant, in order to obtainthe best possible match to the topography of the posterior chamberdefined by the anterior face of the crystalline lens 2, at the rear, andthe posterior face of the iris, at the front.

In all three cases, this implant is accommodated as well as can beexpected in the shape of the posterior chamber 4 without modifying it,i.e. without rubbing on the iris at the front or pushing on thecrystalline lens at the rear, and achieves this with a minimum overallsize.

It is also important to choose a sufficiently flexible material ofmaximum hydrophilia and with a high refractive index so that it can beinserted through a very short incision with minimum trauma.

It goes without saying that the material must also be stable in time,nonirritant and, of course, not cataractogenic.

For the presence of the implant to interfere with the crystalline lensas little as possible, it must have a minimum thickness close to 30 μmat the center in the case of an implant for correcting myopia and closeto 30 μm at the edge of the body in the case of an implant forcorrecting hypermetropia.

It must also have the smoothest possible surface, for example a surfacepolished to a finish from 2 to 3 nm, to prevent long-term pigmentarydispersion through rubbing against the posterior face of the iris.

In particular, there being metabolically active areas only on theanterior face of the crystalline lens, where there are epithelial cells,and in particular at the equator of the crystalline lens, where cellularmultiplication occurs and the crystalline fibers constituting the lensare synthesized, it is sufficient to protect the equator of thecrystalline lens and to avoid trauma of the anterior face of thecrystalline lens and the posterior face of the iris.

Furthermore, the energetic metabolism of the crystalline lens isdiversified and in particular there is only moderate input of oxygenfrom the aqueous humor.

There is therefore no risk of the contact between the implant and theanterior face of the crystalline lens proving cataractogenic, especiallygiven the extremely small thickness of the implant and its hydrophiliccharacter.

Furthermore, despite the close contact obtained between the implant andthe anterior face of the relaxed crystalline lens, circulation ofaqueous humor between these two surfaces remains possible, because ofanterior-posterior movements of the center of the crystalline lensduring accommodation, which aspirates aqueous humor.

Thus the invention provides a precrystalline intraocular implant withoptimum compatibility for the anatomy and the physiology of theposterior chamber of the eye.

Of course, the embodiments described can be modified in numerous wayswithout departing from the scope of the invention. In particular, theprecrystalline intraocular implant according to the invention can be amultifocal implant for correcting presbyopia. In this case, the anteriorface of the implant can include, for example, in accordance with atechnique known in the art, a central optical area and a plurality ofconcentric annular optical areas, with appropriate radii of curvature.

The width of the arms of the haptic part could differ from one arm toanother, rather than being constant. The same applies to the haptic partin general.

What is claimed is:
 1. A precrystalline intraocular implant adapted tobe implanted between an anterior face of the crystalline lens (2) andthe iris, the implant comprising an optical part (6′) formed on acentral body (8′) of an optical implant and a haptic part (7′), aposterior face of the body including a central spherical first portion(21A, 31A, 41A) having a first radius (R1), an annular spherical secondsurface portion (22A, 32A, 42A) having a second radius (R2) greater thanthe first radius, characterized in that a concentric spherical thirdportion surrounds the second portion and has a third radius (R3) greaterthan the second radius (R2).
 2. A precrystalline intraocular implantaccording to claim 1, characterized in that the radii of curvature (R1,R2, R3) of said surface portions correspond to those of the anteriorface of the crystalline lens (2) when relaxed.
 3. A precrystallineintraocular implant according to claim 1, characterized in that thewhole of the body (8′) constitutes a monofocal optical part (6′) and theanterior face of the body includes a spherical central surface having afirst radius and an annular surface having a second radius.
 4. Aprecrystalline intraocular implant according to claim 1, characterizedin that the optical part (6′) comprises only a central area (21, 41) ofthe body, which has a haptic ring (22, 42) surrounding the optical part.5. A precrystalline intraocular implant according to claim 1,characterized in that the haptic part (7′) includes a peripheral ring(24) and arms (23, 33, 43) connecting the peripheral edge of the body(8′) and the peripheral ring (24).
 6. A precrystalline intraocularimplant according to claim 5, characterized in that the haptic part (7′)includes large apertures (25) delimited by a pair of arms (23, 33, 43),the peripheral edge of the body (8′), and the peripheral ring (24).
 7. Aprecrystalline intraocular implant according to claim 5, characterizedin that the haptic part (7′) includes apertures (25) extending over atotal angular sector greater than or equal to 180°.
 8. A precrystallineintraocular implant according to claim 5, characterized in that thehaptic part (7′) includes at least four radial arms (23, 33, 43) of thesame width.
 9. A precrystalline intraocular implant according to claim5, characterized in that the haptic part (7′) includes radial arms (23,33, 43) in the form of angular sectors delimiting apertures (35).
 10. Aprecrystalline intraocular implant according to claim 1, characterizedin that the posterior face of the implant (21A, 31A, 41A) is conformedto adhere spontaneously to the anterior face of the relaxed crystallinelens.
 11. A precrystalline intraocular implant according to claim 10,characterized in that the concentric spherical third surface portioncorresponding to the arms (23, 33, 43) and to the peripheral ring (24)has a radius of curvature (R3) substantially equal to the radius ofcurvature in the equatorial region of the anterior face of the relaxedcrystalline lens (2) and the diameter of the peripheral ring (24) isadapted to match the diameter of the crystalline lens.
 12. Aprecrystalline intraocular implant adapted to be implanted between ananterior face of the crystalline lens (2) and the iris, comprising; anoptical part (6) formed on a central body (8) and a haptic part (7), aposterior face of the body including a central spherical portion (10B)having a first radius (R1) and a spherical annular surface portion (10C)having, a second radius (R2) greater than the first radius,characterized in that a periphery of the haptic part is conformed tobear in the ciliary sulcus (5).
 13. A precrystalline intraocular implantaccording to claim 12, characterized in that the radii of curvature (R1,R2) of said surface portions correspond to those of the anterior face ofthe relaxed crystalline lens
 2. 14. A precrystalline intraocular implantaccording to claim 12, characterized in that the optical part (6)comprises only a central area (11) of the body, the body having a hapticring (12) surrounding the optical part.
 15. A precrystalline intraocularimplant according to claim 12, characterized in that the haptic part (7)includes a peripheral ring (14) and arms (13) connecting the peripheraledge of the body (8′) and the peripheral ring (14).
 16. A precrystallineintraocular implant according to claim 15, characterized in that thehaptic part (7) includes large apertures (15) delimited by a pair ofarms (13), the peripheral edge of the body (8), and the peripheral ring(14).
 17. A precrystalline intraocular implant according to claim 15,characterized in that the haptic part (7) includes apertures (15)extending over a total angular sector greater than or equal to 180°. 18.A precrystalline intraocular implant according to claim 15,characterized in that the haptic part (7) includes at least four radialarms 13) of the same width.
 19. A precrystalline intraocular implantaccording to claim 15, characterized in that the haptic part (7)includes radial arms (13) in the form of angular sectors delimitingapertures (25).
 20. A precrystalline intraocular implant according toclaim 12, characterized in that the posterior face of the implant (10A)is conformed to adhere spontaneously to the anterior face of thecrystalline lens.
 21. A precrystalline intraocular implant according toclaim 15, characterized in that said arms (13) are inclined to the rearat an angle of substantially 10° as far as the peripheral ring (14).